<template>
  <div class="score-case">
    <div class="table">
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>科目</th>
            <th>成绩</th>
            <th>考试时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="list.length">
          <tr v-for="(item,index) in list" :key=item.id>
            <td>{{index+1}}</td>
            <td>{{item.subject}}</td>
            <td class="red">{{item.score}}</td>
            <td>{{fndata(item.date)}}</td>
            <td><a href="#" @click="deleted(item.id)">删除</a></td>
          </tr>
         
        </tbody>
        <tbody v-else>
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody>
        <tfoot>
          <tr>
            <td colspan="5">
              <span>总分：{{get}}</span>
              <span style="margin-left:50px">平均分：{{set===0?0:set.toFixed(2)}}</span>
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
    <div class="form">
      <div class="form-item">
        <div class="label">科目：</div>
        <div class="input">
          <input v-model.trim="subject" type="text" placeholder="请输入科目" />
        </div>
      </div>
      <div class="form-item">
        <div class="label">分数：</div>
        <div class="input">
          <input v-model.number="score" type="text" placeholder="请输入分数" />
        </div>
      </div>
      <div class="form-item">
        <div class="label"></div>
        <div class="input">
          <button @click="add" class="submit" >添加</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
//导入
import moment from 'moment'
export default {
  name: 'ScoreCase',
  data () {
    return {
    /*   list: [
        {id: 15, subject: '语文', score: 89, date: new Date('2022/06/07 10:00:00')},
        {id: 27, subject: '数学', score: 100, date: new Date('2022/06/07 15:00:00')},
        {id: 32, subject: '英语', score: 56, date: new Date('2022/06/08 10:00:00')},
        {id: 41, subject: '物理', score: 76, date: new Date('2022/06/08 10:00:00')}
      ], */
      //取出本地存储
      list:JSON.parse(localStorage.getItem('list')||'[]'),
      subject: '',
      score: ''
    }
  },
  methods:{
    deleted(id){
           const Index=this.list.findIndex((item)=>item.id===id)
           this.list.splice(Index,1)
    },
    add(){
      if(this.subject==="" || this.score==="") return alert('请输入的不要为空值')
      this.list.push({
        id:Date.now(),
        subject:this.subject,
        score:this.score,
        date:new Date()
      
      }),
      this.subject='',
      this.score=''
    },
    fndata(data){
    return moment(data).format('YYYY-MM-DD HH:mm:ss ')
    
    },
  },
  
  computed:{
         get(){
      return this.list.reduce((sum,item)=>sum+item.score,0)
    },
     
  
    set(){
     
       return (this.get/this.list.length)||0
      }
  },
  watch:{
    list:{
      deep:true,
      handler(){
        //传入到本地存储
        localStorage.setItem('list',JSON.stringify(this.list))
      }
    }
  }
};
</script>

<style lang="less">
.score-case {
  width: 1000px;
  margin: 50px auto;
  display: flex;
  .table {
    flex: 4;
    table {
      width: 100%;
      border-spacing: 0;
      border-top: 1px solid #ccc;
      border-left: 1px solid #ccc;
      th {
        background: #f5f5f5;
      }
      tr:hover td {
        background: #f5f5f5;
      }
      td,
      th {
        border-bottom: 1px solid #ccc;
        border-right: 1px solid #ccc;
        text-align: center;
        padding: 10px;
        &.red {
          color: red;
        }
      }
    }
    .none {
      height: 100px;
      line-height: 100px;
      color: #999;
    }
  }
  .form {
    flex: 1;
    padding: 20px;
    .form-item {
      display: flex;
      margin-bottom: 20px;
      align-items: center;
    }
    .form-item .label {
      width: 60px;
      text-align: right;
      font-size: 14px;
    }
    .form-item .input {
      flex: 1;
    }
    .form-item input,
    .form-item select {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      width: 200px;
      height: 40px;
      box-sizing: border-box;
      padding: 10px;
      color: #666;
    }
    .form-item input::placeholder {
      color: #666;
    }
    .form-item .cancel,
    .form-item .submit {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      border-radius: 4px;
      padding: 4px 10px;
      margin-right: 10px;
      font-size: 12px;
      background: #ccc;
    }
    .form-item .submit {
      border-color: #069;
      background: #069;
      color: #fff;
    }
  }
}
</style>